Questions and Answers
Which of the following statements is true about a relative risk less than 1?
The event is less likely to occur if there was exposure.
In a clinical trial, if the relative risk is calculated to be 0.5, how does this impact the likelihood of the event occurring with exposure?
The event is half as likely to happen with exposure.
What can be inferred if the relative risk in a study is 0.8?
Exposure reduces the likelihood of the event.
If a relative risk value is 1.2, what does this suggest about the occurrence of the event with exposure?
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What does a relative risk equal to 1 indicate about the occurrence of an event with exposure?
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Study Notes
Measuring Effect of Exposure
- A measure of effect looks at the proportion of patients spared from an adverse outcome in absolute terms.
- This measure is different from relative risk, which compares the risks in two groups.
Relative Risk (RR)
- Relative risk is the ratio of risks in two groups, calculated in cohort studies and clinical trials.
- RR can be interpreted in the following ways:
- If RR = 1, exposure is not associated with the disease.
- If RR > 1, exposure is positively associated with the disease, indicating increased risk.
- If RR < 1, the event is less likely to occur if there was exposure, indicating decreased risk.
